package git.soulbgm.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.task.TaskExecutionProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * 异步配置
 *
 * @author SoulBGM
 * @date 2021/06/17
 */
@Configuration
@EnableAsync
public class AsyncConfig {

    @Autowired
    private TaskExecutionProperties properties;

    @Bean
    public Executor myTaskAsyncPool() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(properties.getPool().getCoreSize());
        executor.setMaxPoolSize(properties.getPool().getMaxSize());
        executor.setQueueCapacity(properties.getPool().getQueueCapacity());
        executor.setKeepAliveSeconds((int) properties.getPool().getKeepAlive().getSeconds());
        executor.setThreadNamePrefix(properties.getThreadNamePrefix());

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是由调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }

}
